Theoretically lures could work but only if you mount one on a large garbage can since it will pull staggering amounts of beetles.
I bought a battery hand vacuum this year to suck them up and dump in a bucket. I’m hoping I’ll startle fewer beetles than slapping them into the bucket by hand and so kill more quicker.
The beetles I drown that way go untouched for weeks when I dump them out so I don’t think anything local eats them.
I knock the beetles into a cup of water and then give them to my chickens. I love that “snap! snap!” they make when they eat the beetles. I also hung a beetle trap, really low, in the chicken yard. Look out the window and the chickens are jumping into the air trying to catch beetles in flight.
One year I got so fed up with them eating everything in my yard that I wrote a whole book about all the different ways to discourage or eradicate Japanese beetles. Japanese Beetles and Grubs: Trap, Spray, and Control Them
Milky Spore is a bacteria… I theorized that bacteria will grow and spread, on it’s own. I spread 40oz or 2.5lb of them, probably across between 1 and 1.5 acre. Fairly “light” per the distributor’s recommendations. We have more land but it’s forested, I assumed the JB would tend to prefer the yards or orchard space with more open grasses. Two years in and there are certainly less of them than prior years. Far from zero but still a noticeable decrease. Hopefully the bacteria spreads more and the decreasing trend continues…
We have had a remarkably ‘light’ beetle population this year. And we can’t figure out why. They usually decimate all of our plums’ foliage . . . and do lots of blossom damage on the pomegranates. In fact, they are know to be one of the primary spreaders of all the fungi that I am continuously fighting. So . . .
maybe I will get some pomegranates, this year, that haven’t been ‘inseminated’ with fungus by the JBs. One can hope . . . . 
1 week into their year 2025 Minnesota appearance, the number of Japanese Beetles I have caught remains very low. I have not yet seen any on my plants. A good portion of the beetles have white spots suggesting a parasitoid wasp (released by the state government) has struck them. I started trapping 5 years ago and have observed a decline since I started.
They are all in my yard. Im worried they are going to run out of things to eat and start eating me.
They tend to explode into a new area for a number of years then the population declines for whatever reason.
We had an earlier location for a nursery when we were first exposed and there were times where there would be clouds of them when we drove the mist blower sprayers through them. Unbelievable numbers. Then the population declines dramatically. They are still around causing problems, but nowhere near what they first were.
Moved to a new farm 10-15 years later, about 45 miles away where they were just getting started, and we saw the same pattern. Unbelievable numbers then a big decline. They cycle up and down over the years.
They showed up yesterday. I had been thinking they might have die off, but no, just late.
I came in from picking cherries an hour ago and just ran my hand over my head and found one stuck in my hair. Felt like the biggest tick in the world 
Odd. Japanese beetles, so far, have stayed in the northwest corner of the orchard and have a strong preference for apricot and plum trees over other fruit trees and an even stronger preference for raspberry bushes.
Rosefiend, I tried your technique of feeding the bitty brittle beasts to our chickens, and it worked!
I really don’t see any, except for one or two on the shrub roses. I shook their favorite cherry tree - nothing came flying out.
This is 3 weeks late for them.
We would never be so lucky that Varroa mites would parasitize Japanese Beetles, giving them a virus.
We had an all-day rain yesterday, and the Japanese beetles dropped from thousands to a few dozen. Don’t know if it was causation or correlation.
Did the temperature drop too? I find that on cool days they won’t be seen hardly at all. But, when it gets hot again they all come out of hiding.
The day before the high was 84°F. Yesterday the high was 64°. This morning with temperature at 68°, the beetle harvest was still a few dozens. Five chickens, starting four days ago, now have temporary quarters in the orchard and can plunder under three of our nine plum trees.